physics 1a, section 2
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Physics 1A, Section 2. September 30, 2010. Contacting Your Section 2 T.A.:. Darren Dowell Email is the best way to reach me: [email protected] You can also try: (626) 395-6675 Caltech office (818) 393-5032 JPL office Office hour: Caltech/Cahill 312 Tuesdays 3:00 – 4:30 PM - PowerPoint PPT PresentationTRANSCRIPT
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September 30, 2010
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Darren DowellEmail is the best way to reach me:
[email protected] can also try:
(626) 395-6675 Caltech office(818) 393-5032 JPL office
Office hour:Caltech/Cahill 312Tuesdays 3:00 – 4:30 PM
Section web site:http://www.submm.caltech.edu/~cdd/
PHYS1A_2010
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http://www.its.caltech.edu/~tmu/ph1a
Final exam: 40%Quizzes: 40%Homework: 20%Section participation: opportunity for some extra
credit
50% to pass course
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The Mechanical Universe: requiredNo chapter summaries, so get used to finding
the formulas you need, and fast.
Feynman: broader context, underlying principles, occasional anecdotes
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Practice problem solvingunassigned Quiz and Final Problemssome problems from Frautschiother examples from astronomy & physics
Review concepts covered in Frautschi and the lecturesDiscuss the ones that you are having the most
trouble with. I need some feedback from you.
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elliptical galaxy Messier 87, 15 Mparsecs away
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Jet of ionized gas seen with Hubble Space Telescope
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0.08 arcsec in 4 yearsdistance d = 15 Mparsec
1 parsec = 3.1 x 1016 m
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0.08 arcsec in 4 yearsdistance d = 15 Mparsec
1 parsec = 3.1 x 1016 m
vapparent = 1.5 x 109 m/s
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0.08 arcsec in 4 yearsdistance d = 15 Mparsec
1 parsec = 3.1 x 1016 m
vapparent = 1.5 x 109 m/s = 5 c (c = speed of light)
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Our mistake was in assuming that the velocity is perpendicular to our line of sight.
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Our mistake was in assuming that the velocity is perpendicular to our line of sight.
If the velocity is nearly toward us, and the gas is moving near the speed of light, the apparent speed is boosted: vapparent = v sin / [1 - (v/c) cos ]
Example: v = 0.99 c, = 20°: vapparent = 5 c
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a) collide, vbike = 5 m/s, vcar = 10 m/s
b) no collisionc) 5/8 m/s2
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Quiz Problem 35Frautschi, Problem 3.12
Optional, but helpful, to try these problems in advance.